an ‧ ti ‧ thet ‧ i ‧ cal /ˌæntɪˈθetɪk ə l/ BrE AmE ( also an‧ti‧thet‧ic /-ˈθetɪk◂/) adjective formal
exactly opposite to something
antithetical to
This violence is completely antithetical to the teaching of the church.
an ‧ ti ‧ thet ‧ i ‧ cal /ˌæntɪˈθetɪk ə l/ BrE AmE ( also an‧ti‧thet‧ic /-ˈθetɪk◂/) adjective formal
exactly opposite to something
antithetical to
This violence is completely antithetical to the teaching of the church.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012